Radiosignaling system



R. C. CLINKER.

RADIQSIGNALING SYSTEM. APPLICATION FILED uovl 29, 1919.

Patented Aug. 9, 1921.

2 SHEETS-SHEET I- Inventor:

S F? W rm C%$ I m m y b R R. C. CLINKER.

RADIOSIGNALING SYSTEM. APPLICATION FILED NOV. 29, 1919.

1,386,8%0.. Patented Aug. 9,1921.

2 SHEETS-SHEET 2- EIIMII'7Z"MIIIT Inventor: Reginald. Charles ClinKer;

. UNHTED STATES PATENT @FFHQE.

REGINALD CLES CLDTKER, 0F RUGBY, ENG-LAND, ASSIGN OR T0 GENERAL ELEC.

TRIO COMPANY, A CORPORATION OF NEW YORK.

nseam.

To (all whom it may concern:

Be it known that T, REGINALD CHARLES CLINKER, a subject of the King ofGreat Britain, residing at Rugby, county of Warwickshire, England, haveinvented certain new and useful Improvements in Radlosignaling Systems,of which the following is a specification.

It is known that by the use of sensitive detectors and rectifiers nowavailableradlo signals can be receivedwithout any,ae r1al wire by meansof acoil or coils set up in a suitable position relatively to thedlrection of the received waves.

The object of my invention is to render such receiving apparatus morereadlly portable and more compact. I have found that it is possible tomake the frame upon which the receiving coil is the instruments (such ascondensers, IGSlStances, batteries and detectors) without any veryserious damping of thereceived oscillations due to the presence of metalbod1es within the coil. The coil can be mounted within a wooden casingprovided with a handle and this-arrangement results in a very compactand portable apparatus whlch occupies 'as'm'all amount of space.

The novel features which I believe to be characteristic of my inventionare set forth with particularity in the appended claims, the inventionitself, however, both as to its organization and method of operation,will best be understood by reference to the following description takenin connection with the accompanying drawing in which Figure 1 is anelevation of the casing with the cover removed showing the coil andother apparatus; Fig. 2 is a plan viewand Fig. 3 is a diagrammatic viewof the connections.

As indicated in the drawing, the containing casing 1 is provided with acarrying handle 2. Mounted within the casing is a frame 3 about whichthe receiving coll 4; is wound, preferably in one layer. The coil issupported on corner pieces 5 so as to provide an air space between theframe and the coil.

, .Mounted within the coil is a variable condenser 20 connected inparallel to the coil. A condenser 6 is connected to the grid 'of adetecting valve 7. Underneath the detecting valve is mounted 'anamplifying valve 8 which is arranged with its axis at right angles tothe detecting valve, and which projects outwardly in sucha manner thatthe Specification of Letters Patent.

wound contain within it Patented Aug. 9, 1192251.

Application filed. November 29, 1919. Serial No. 341,453.

cover of the casing will not close as long as the amplifier is inposition. Storage battery 9 supplies current for the heating of thefilaments of the valves 7 and 8, the connections being made through'thesocket 10, the plug of which is provided with a handle of such lengththat if it is left in the circuit the door or lid 11 of the case can notbe closed. This provides a convenient method of insuring that thefilament will not be left connected to the storage battery when theapparatus is not in use. Another battery 26 supplies current for theplate circuits of the valves 7 .and 8. Transformers 30 and 31 are usedas indicators, the former for connecting the detector to the amplifierand the latter for connecting the plate circuit of the amplifier to thetelephone 23. The frame 13 hinged to the frame 3 carries a coil 14 whichis connected in series with the plate circuit of the detector 7. Byadjusting the position of the coil 14 relatively to the coil 3 avariable coupling between the coils may be obtained. The casing 1 may berotatably mounted upon, a pin 15 which can conveniently be secured tothe door 11 and enters a socket 16 secured to the casing directly underits center of gravity. When it is desired to operate the apparatus thedoor 11 may be removed from its hinges and the cas ing mounted on thedoor in the manner indicated so that the receiving coil may beconveniently rotated to any desired direction. A compass card or scale17 may be fixed to the inner side of the door 11 and the cooperatingpointer 18 secured to the casing. For convenience the pointer may bedetachable or hinged to the casing. A magnetic needle 19 may also bemounted on the cover so as to enable the latter to be adjusted until thenorth of the scale 17 ispointed tothe north.

The telephones 23 may be carried inside the casing and connected incircuit by means of the jacks 27.

The receiving coil 4 is tuned to the frequency of the incoming waves bya condenser 20 and is connected through condenser 6 provided with aresistance leak 21 to the grid of the detector 7 whose plate 22 is fedfrom the battery 16 through the transformer 30 and the coil 14. Thefilaments of valves 7 and 8 are heated by current from the battery 9.The secondary of transformer 30 is connected to the grid of valve-8 inthe plate circuit of which is the primary of the telephonetransformer31. A cell of battery 24 may be inserted in the grid circuitof the valve8 to maintain the id negative. with respect to the filament. g condenser25 may be provided to allow high frequency current to be shunted aroundthe primary of transformer 30 when the valve 7 produces oscillations.

To receive signals condenser 20 is adjusted until the natural frequencyof coil 4 and condenser 20 corresponds to that of the received waves.The coupling between thecoils 4 and 14 is then adjusted by the turningof the latter upon its hinges. The line of direction along which thesignals travel is found by turning the casing on its pivot 15 until thesignals have no effect upon the instrument, in which position thepointer 18 would indicate the direction desired.

While I have indicated and described the preferred form of my inventionit will be apparent to one skilled in the art that many modifications inthe precise apparatus used and the arrangement of apparatus as well asin the form of the casing in which the apparatus is assembled may bemade without departing from the scope of my invention as set forth inthe appended claims.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is,

1. A receiving apparatus for radio signals comprising a casing, areceiving antenna wound upon a frame within said casing, a receivingcircuit associated with said receiving coil, said receiving circuitcomprising a tuning condenser and a detector and said tuning condenserand detector being mounted within the frame upon which the receivingcoil is wound.

2. A receiving apparatus for radio signals comprising a casing, areceiving antenna wound upon a frame within said casing, a

receiving system comprising an amplifier and a detector and means foroperatively connecting said amplifier and detector in the receivingsystem, said amplifier and detector together with the means for connecting them in the receiving system being mounted within the-frame uponwhich the receiving coil is wound.

3. A receiving apparatus for radio signals comprising a casing, areceiving coil wound upon a frame within said casing, a receiving systemcomprising a detector having plate and grid circuits associatedtherewith, said receiving coil being included'in said grid circuit, asecond coil mounted upon a frame which is hinged to the frame upon whichthe receiving coil iswound,said second coil being included in the platecircuit of said detector and said detector and the circuit connectonstherefor being mounted within the frame upon which the receiving coil iswound.

. 4. A receiving apparatus for radio signals comprising a casing, areceiving antenna wound upon a frame within said casing, a receivingsystem comprising a detector having plate and grid'circuits associatedtherewith, said receiving antenna being included in said grid circuitand a. second coil which is included in the plate circiut of saiddetector, said second coil being hinged to one side of the frame uponwhich the.

first coil is wound and adapted to be rotated to a position where it.will be inclosed by the frame upon which the first coil is. wound.

In witness whereof I have hereunto set my hand this twelfth day ofNovember,

R. C. CLINKER.

WVitnesses:

JOHN HALFoRD, DOROTHY WHITE.

